Although retention knobs often look very similar they are not
interchangeable. The use if an incorrect knob or the misuse of
a knob may result in injury or property damage. It is the
responsibility of the end user to verify the supplied knob is
correct for the machine.
Retention knob failures may occur for several
Improper knob configuration, misaligned machines, metal fatigue due
to usage, over torquing, exceeding the machine's capability, etc.
Retention knobs should be periodically be inspected.
If there are signs of excessive wear or damage, the retention knob
should be replaced.